PLUMBING CODE III

Question 1

Maximum number of slip joint fitting that may be used on the outlet side of a trap

Answer 1

Correct answer: 1
Source: RNPCP, Chapter 10

“No more than one (1) approved slip joint fitting may be used on the outlet
side of a trap”

Question 2

Elastomeric gasketed and rubber-ring joints shall comply with _____ installation standard

Answer 2

Correct answer: IAPMO (International Association of Plumbing and Mechanical officials)

Source: RNPCP, Chapter 13

Question 3

ASTM

Answer 3

American Society for Testing and Materials

Question 4

ANSI

Answer 4

American National Standards Institute

Question 5

NAMPAP

Answer 5

National Master Plumbers Association of the Philippines

Question 6

What is the maximum length allowed for a vent stack serving 48 DFU?

Answer 6

Correct answer: 55 m
Source: RNPCP, Chapter 7

Question 7

length of vent can accommodate 24 DFU

Answer 7

37 m

Question 8

length of vent can accommodate 84 DFU

Answer 8

65 m

Question 9

What will be the size of 0.5% sloped circular bottom gutter serving a roof area of 180 sqm, and the rainfall intensity around the area is 76 mm/hr?

Answer 9

Correct answer: 178 mm
Source: RNPCP, Chapter 11

Additional Info:
You may refer to Table 11-2a, however, do not expect that the board exam includes table for reference.

You may use the formula taught in our classes to solve this kind of problem.

Question 10

A water that stands in or passes through the ground

Answer 10

Correct answer: Ground water
Source: RNPCP, Chapter 2

Question 11

runs off over the surface of the ground

Answer 11

Surface water

Question 12

runs off over the earth surface after a storm

Answer 12

Storm water

Question 13

Minimum water seal of a grease trap

Answer 13

Correct answer: 51 mm
Source: RNPCP, Chapter 10

Question 14

water seal of an interceptor or clarifier

Answer 14

152 mm

Question 15

The size of a vent pipe is determined by _____.

Answer 15

Correct answer: FU and length
Source: RNPCP, Chapter 7, Table 7-5, and Chapter 9

Question 16

Which of the following may be true about the sovent system?

Answer 16

Correct answer: it has lesser maintenance cost

Additional info:
- Among the choices, “it has lesser maintenance cost” is the best answer. In some cases, sovent may also require lesser up-front cost as it requires lesser space, labor, and pipe network. There are also fewer maintenance points.
- Sovent system does not require more space for installation, as it eliminates the need for more branch/group venting, and the main vent. Hence, the sovent system does not also use more pipe network.
- Aerator and deaerator fittings help maintain air pressure. The stack is also terminated at the roof.

Question 17

Wet venting is limited to _____ fixtures

Answer 17

Correct answer: 4
Source: RNPCP, Chapter 8

Question 18

limit of wet venting

Answer 18

1 and 2 fixture unit trap arm

Question 19

What is the estimated sewage flow rate of bowling alleys with snack bar only?

Answer 19

Correct answer: 283.9 LpD per lane
Source: RNPCP, Annex B

You may convert the values to Gallons for easier memorization.

Question 20

_____ are recommended for oil handling piping works.

Answer 20

Correct answer: Neoprene gaskets
Source: RNPCP, Chapter 13

Question 21

a mechanical connection which depends on an internal retention device to prevent pipe or tubing separation

Answer 21

Pressure-Lock Type

Question 22

used for hubless cast iron

Answer 22

Shielded Coupling

Question 23

used for high-pressure applications such as air-conditioning, refrigeration

Answer 23

Brazing

Question 24

In getting the roof area for the computation of rainwater piping size, for two walls opposite of differing heights, add ____ of wall area above top of lower wall to the roof area.

Answer 24

Correct answer: 50%
Source: RNPCP, Chapter 12

Question 25

For two adjacent walls

Answer 25

add 35% percent of the total wall areas to the roof area.

Question 26

For one wall

Answer 26

add 50% of area of the wall to the roof area

Question 27

Maximum length of a tailpiece

Answer 27

Correct answer: 0.6 m Source: RNPCP, Chapter 10

Question 28

Connects directly with an individual trap underneath or behind the fixture

Answer 28

Correct answer: Backvent Pipe (sometimes called an individual vent) Source: RNPCP, Chapter 2

Question 29

vents a fixture trap and connects above the fixture served or terminates in the open air

Answer 29

Individual Vent

Question 30

a pipe or shaft to convey foul air from "a plumbing fixture" or "a room to the outer air"

Answer 30

Local vent

Question 31

What can be drained through an airbreak?

Answer 31

Correct answer: Air Washer Source: RNPCP, Chapter 8

Question 32

is installed for: Cold storage room, refrigerator, cooling counter, compartment, receptacle, appurtenance or device used for the storage or holding of food or drink,

Answer 32

Airgap

Question 33

is installed for: Evaporative cooler, air washer, or similar airconditioning equipment

Answer 33

Air break

Question 34

What is the sewage that turns dark and smell unpleasantly due to anaerobic decomposition?

Answer 34

Correct answer: septic Source: PDE by Max Fajardo

Question 35

the floating parts in a septic tank

Answer 35

scum

Question 36

the semi-liquid substance that accumulates at the bottom

Answer 36

sludge

Question 37

"Vertical vent pipes" installed in a roof used for "other purposes" shall extend a minimum of _____ above such roof.

Answer 37

Correct answer: 2.1 m Source: RNPCP, Chapter 9

Question 38

vertical clearance of vent opening from openable window, door opening

Answer 38

3 m

Question 39

horizontal clearance from lot line, alley, openable window, door opening

Answer 39

0.9 m

Question 40

horizontal clearance of vent pipe above the roof from any "vertical surface nearby"

Answer 40

0.3 m

Question 41

Water closets that are made to accommodate overweight and obese people

Answer 41

Correct answer: Bariatric Water Closet Source: ASPE Volume 4

Question 42

a.k.a Close-coupled toilet- the bowl and cistern are closely "coupled" together

Answer 42

Two Piece Water Closet

Question 43

uses "two jet streams" to clean out the bowl with as little water as possible

Answer 43

Double Cyclone Water Closet

Question 44

The principal artery of the venting system to which vent branches are connected.

Answer 44

Correct answer: Main Vent Source: RNPCP, Chapter 2

Question 45

The vertical vent pipe installed primarily for providing circulation of air to and from "any part of the soil, waste of the drainage system"

Answer 45

Vent Stack

Question 46

The extension of a soil or waste stack above the highest horizontal drain connected to the stack

Answer 46

Stack Vent

Question 47

This type of ground surface generate more rainwater run-off.

Answer 47

Correct answer: concrete sidewalk Additional info: Sidewalks built of concrete or asphalt don't let water infiltrate

Question 48

What is an underground drain pipe that receives only sub-surface or seepage water and convey it to a sump for disposal by gravity flow or by lift pump?

Answer 48

Correct answer: subsoil drain Source: RNPCP, Chapter 2

Question 49

the pipeline from the "building to the public or street storm drainage system"

Answer 49

House Storm Sewer

Question 50

that portion of an underground system, which cannot drain by gravity into the building sewer

Answer 50

Building Subdrain

Question 51

a trench filled with a perforated pipe and gravel that allows water to drain naturally from your yard

Answer 51

French drain

Question 52

What is the gauge pressure to be maintained for air tests as substitute for water test in water pipings?

Answer 52

Correct answer: 344.5 kpa (or 50 psi) Source: RNPCP, Chapter 5

Question 53

for air test

Answer 53

5 psi

Question 54

for water test

Answer 54

3 meter head of water for 15 minutes

Question 55

Minimum dimension of a sand interceptor's inlet opening

Answer 55

Correct answer: 0.2 sqm Source: RNPCP, Chapter 10

Question 56

In a granule test of a water closet, the initial flush of three different flushes must result in no more than _____ on average remaining in the bowl.

Answer 56

Correct answer: 125 Source: ASPE Volume 4 Additional info: - Granule test simulates a flush of watery feces - The granule test utilizes approximately 2,500 disc-shaped granules of polyethylene

Question 57

Every abandoned building sewer shall be plugged or capped within _____ of the property line.

Answer 57

Correct answer: 1.5 m Source: RNPCP, Annex B

Question 58

What is required when a soil or waste stack extends 10 or more stories?

Answer 58

Correct answer: Parallel vent stack; at every fifth floor levels, a yoke vent is installed Source: Chapter 9

Question 59

a form of a private sewage disposal system, which is installed whenever a building/house does not have any access to a public sewer

Answer 59

Septic tank

Question 60

a sanitary drainage system which allows the drain, waste and venting to be performed through a single stack.

Answer 60

Sovent System

Question 61

Determine the size of horizontal rainwater piping with a slope of 2% for a 350 sqm roof in an area where the the rainfall is 102 mm/hr.

Answer 61

Correct answer: 127 mm Source: RNPCP, Chapter 11 Additional Info: You may refer to Table 11-2a, however, do not expect that the board exam includes table for reference. You may use the formula taught in our classes to solve this kind of problem.

Question 62

A group vent pipe that connects to the vent stack

Answer 62

Correct answer: circuit vent Source: RNPCP, Chapter 2

Question 63

connects to the Stack Vent

Answer 63

Loop Vent

Question 64

the extension of a soil or waste stack above the highest horizontal drain connected to the stack

Answer 64

Stack Vent

Question 65

vertical vent line, the primary function is to provide "additional circulation" of air between the drainage and vent systems

Answer 65

Relief Vent

Question 66

What is the minimum condensate pipe diameter of a cooling equipment with capacity through 125 ToR?

Answer 66

Correct answer: 38 mm Source: RNPCP, Chapter 8

Question 67

3 ToR

Answer 67

19.1 mm

Question 68

20 ToR

Answer 68

25.4 mm

Question 69

90 ToR

Answer 69

32 mm

Question 70

125 ToR

Answer 70

38 mm

Question 71

250 ToR

Answer 71

51 mm

Question 72

The minimum depth of the sand interceptor under the invert of the outlet pipe is _____.

Answer 72

Correct answer: 610 mm Source: RNPCP, Chapter 10

Question 73

minimum length of the inlet compartment of a septic tank

Answer 73

1500 mm

Question 74

minimum width of the inlet compartment of a septic tank

Answer 74

900 mm

Question 75

For accessible toilets, signs on walls and doors should be located at a maximum height of _____.

Answer 75

Correct answer: 1.60 m Source: BP 344

Question 76

minimum height of signs on walls and doors

Answer 76

1.40 m

Question 77

maximum height of flush control

Answer 77

1.20 m

Question 78

Septic tanks should be cleaned when scum or sludge occupies ____ of the tank volume.

Answer 78

Correct answer: 1/3 Source: Audel

Question 79

Minimum distance of a 32 mm trap arm diameter to a vent

Answer 79

Correct answer: 64 mm Source: RNPCP, Chapter 10 Additional info: - length of trap arm shall in no case be less than two times the diameter of the trap arm - 32 mm x 2 = 64 mm - the maximum length of a 32 mm trap arm is 0.76 m

Question 80

An exterior vertical drainage pipe for conveying storm water from roof or gutter drains.

Answer 80

Leader

Question 81

a pipe inside the building that conveys storm water from the roof to a storm drain, combined building sewer, or other approved point of disposal

Answer 81

Conductor

Question 82

The vertical portion of a rainwater conductor

Answer 82

Downspout

Question 83

Unit of the plumbing system that conveys rain or storm water to a suitable terminal

Answer 83

Storm Drain

Question 84

If the development is mostly built of concrete flooring, how can this affect the storm water sizing?

Answer 84

Correct answer: the drains might be larger Additional info: - the stormwater sewer may necessitate larger diameter or channel, as impervious surface prevent rainwater to infiltrate into the ground

Question 85

Prohibited vent pipe material below ground

Answer 85

Correct answer: Galvanized wrought iron Source: RNPCP, Chapter 9 Additional info: - no galvanized wrought iron or galvanized steel pipe shall be used underground and shall be kept at least 15 cm above ground

Question 86

Rainwater piping located within a medium height building basement area shall be of Galvanized Iron, _____.

Answer 86

Correct answer: Schedule 30 Source: RNPCP, Chapter 11

Question 87

All condensers and sumps shall be properly trapped at the outlet with a deep seal trap extending to within ____ of the bottom of the tank.

Answer 87

Correct answer: 6" Source: RNPCP, Chapter 8

Question 88

Horizontal distance of the trap arm with a diameter of 38 mm

Answer 88

Correct answer: 1.07 m Source: RNPCP, Chapter 10

Question 89

Horizontal distance of the trap arm with a diameter of 32 mm pipe size

Answer 89

- 0.76 m

Question 90

Horizontal distance of the trap arm with a diameter of 38 mm pipe size

Answer 90

1.07 m

Question 91

Horizontal distance of the trap arm with a diameter of 51 mm pipe size

Answer 91

1.52 m

Question 92

Horizontal distance of the trap arm with a diameter of 76 mm pipe size

Answer 92

1.83 m

Question 93

Horizontal distance of the trap arm with a diameter of 102 mm & larger pipe size

Answer 93

3.05 m

Question 94

The side walls of a Septic Tank shall be at least ____ above the liquid depth.

Answer 94

Correct answer: 9" or 228 mm Source: RNPCP, Appendix B

Question 95

What is the horizontal distance required of a vent pipe from any openable window, door opening, air intake, or vent shaft?

Answer 95

Correct answer: 3m Source: RNPCP, Chapter 9

Question 96

vertical extension of a vent pipe or SVTR above the roof

Answer 96

0.15 m

Question 97

distance of a vent pipe or SVTR from any vertical surface nearby

Answer 97

0.3 m

Question 98

vertical distance of a pipe or SVTR above any openable window, door opening, air intake; also the distance of a vent pipe or SVTR away from any lot line, alley, and street boundary lines

Answer 98

0.9 m

Question 99

What downspout size would you specify for a 800 sqm roof with a rainfall intensity around the area of 152.4 mm/hr?

Answer 99

Correct answer: 152 mm Source: RNPCP, Chapter 11 Additional Info: You may refer to Table 11-2a, however, do not expect that the board exam includes table for reference. You may use the formula taught in our classes to solve this kind of problem.

Question 100

The maximum trap loading of a pipe size 76 mm

Answer 100

Correct answer: 6 FU Source: RNPCP, Chapter 7

Question 101

The maximum trap loading of 32 mm pipe size

Answer 101

1 FU

Question 102

The maximum trap loading of 38 mm pipe size

Answer 102

3 FU

Question 103

The maximum trap loading of 51 mm pipe size

Answer 103

4 FU

Question 104

The maximum trap loading of 76 mm pipe size

Answer 104

6 FU

Question 105

The maximum trap loading of 102 mm pipe size

Answer 105

8 FU

Question 106

Minimum spacing between trenches or leaching beds

Answer 106

Correct answer: 1.20 m Source: RNPCP, Appendix B

Question 107

distance on center of each distribution drain lines

Answer 107

1.80 m

Question 108

maximum distance of perimeter of "leaching bed to a distribution drain line"

Answer 108

0.90 m

Question 109

If a septic tank can have an effective capacity of 4000 L, how much does the secondary compartment hold?

Answer 109

Correct answer: 1,333 L Source: Appendix B Additional info: The maximum capacity of the secondary compartment of a septic tank is 1/3 of the total capacity of such tank. - 1/3 of 4000 L is 1,333 L

Question 110

When the first compartment exceeds 3.7 m in length, an additional ____ shall be provided.

Answer 110

Correct answer: Manhole Source: Appendix B Additional info: - wherever a first compartment exceeds 3.7 m in length, an additional manhole shall be provided over the baffle wall

Question 111

What is the minimum distance from disposal field to another disposal field?

Answer 111

Correct answer: 1.2 m Source: RNPCP, Annex B

Question 112

distance of disposal field to buildings or structures

Answer 112

2.4 m

Question 113

distance of disposal field to property line, seepage pits or cesspools, on site domestic water service line, and distribution box

Answer 113

1.5 m

Question 114

What is the storage factor for self-service auto washers?

Answer 114

Correct answer: 1.5 Source: RNPCP, Annex B

Question 115

Employee-operated auto washer: Storage factor is

Answer 115

Storage factor is 2

Question 116

Which among the choices is a prohibited trap?

Answer 116

Correct answer: Crown trap Source: RNPCP, Chapter 10

Question 117

may be installed only when permitted by administrative authority

Answer 117

Drum traps

Question 118

commonly used underneath sinks

Answer 118

Bottle traps

Question 119

a basin in the ground that receives piped wastewater from your house before it enters the underground sewer

Answer 119

Gully trap